Need some suggestions

Hey guys. I'm new here, but I'm here mainly for my brother. Christmas is coming up and I'm looking to get him something for his truck for Christmas. He has an 06 Silverado HD (Duramax and Allison trans). He won't want anything overboard, so I was thinking maybe a turbo timer or since he mainly tows with it, maybe some guages (for things like ECT...I think that's the right term, I don't have much experience with diesels). Any other suggestions? Maybe a nice intake or something? Sites that have parts for this vehicle would be greatly appreciated too!

You can check out stylintrucks.com and autoanything.com. Both places you can enter the year, make and model of the truck and it will show parts that fit it. They're great places to look for ideas. Good luck!